Did you know that if it's made of nylon 6, your old carpet can be recycled? Over 200 million pounds of old carpet is saved from landfills every year through the recycling of nylon 6. Through a process of deep polymerization and purification, nylon 6 can be re-harvested and reused in new carpet.
For more on carpeting, consider:
Radio: Recycling Carpet
Carpet Tiles Combine Convenience and Fashion
What Would Bob Do? Removing Wall-to-Wall Carpeting